Use examples
Find some worked examples from a textbook or maths website and go through them. Try to work out the steps which have been used to solve the problems. If you struggle to understand the process, start with some simple problems and work up to more complex ones.
Practise, practise
If you practise  it will get easier. If you really want to improve, repetition is important.
Attempt some problems by yourself and check the solutions, or ask someone to look at your workingout.
Then do some more.
Share the load
Work with someone else  it can help to talk things through and show someone how you tried to tackle a problem.
Ask for help if you are stuck.
Discover what you are doing wrong
Analyse your errors  look at where you went wrong and what caused it. Decide if you are likely to make the same mistake again.
Are you:
 missing out steps
 doing the steps in the wrong order
 rushing
 making errors in calculations
